From: Vladimir Oltean <vladimir.oltean@nxp.com>
To: Robin Murphy <robin.murphy@arm.com>
Cc: devicetree@vger.kernel.org, iommu@lists.linux.dev,
Laurentiu Tudor <laurentiu.tudor@nxp.com>,
Will Deacon <will@kernel.org>,
linux-arm-kernel@lists.infradead.org,
Shawn Guo <shawnguo@kernel.org>, Li Yang <leoyang.li@nxp.com>,
Rob Herring <robh+dt@kernel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
linux-kernel@vger.kernel.org, Michael Walle <michael@walle.cc>
Subject: Re: [RFC PATCH] arm64: dts: ls1028a: mark ARM SMMU as DMA coherent
Date: Thu, 5 Jan 2023 14:04:47 +0200 [thread overview]
Message-ID: <20230105120447.vnr24pusr3ihdhwk@skbuf> (raw)
In-Reply-To: <67ae3a53-3db9-c1bc-2b67-08df14bc15cc@arm.com>
On Tue, Jan 03, 2023 at 06:12:29PM +0000, Robin Murphy wrote:
> > I have a side question, why is the dev_name() of your SMMU set to
> > "arm-smmu.0.auto" (determined by PLATFORM_DEVID_AUTO if I'm not mistaken)?
>
> This is an ACPI-based machine, where platform device discovery and creation
> is... different :)
>
> SMMUs are among those managed by drivers/acpi/arm64/iort.c
>
> > I'm asking because I would like to study the mechanism through which
> > your SMMU platform device get probed, to make sure that it's not
> > possible, during shutdown, for both platform_driver :: shutdown()
> > and platform_driver :: remove() methods to get called by the driver core.
> > This is generally not disallowed, and even possible if the entity who
> > registers these platform devices has its ->shutdown() method pointing
> > at ->remove().
>
> Yikes, I'd very much hope that that's not a thing!
Ah, ok. Appears to be fine. Looking at drivers/acpi/arm64/iort.c,
it seems that no one is removing those platform devices.
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prev parent reply other threads:[~2023-01-05 22:58 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-12-08 15:15 [RFC PATCH] arm64: dts: ls1028a: mark ARM SMMU as DMA coherent Vladimir Oltean
2022-12-08 19:01 ` Robin Murphy
2022-12-14 16:53 ` Vladimir Oltean
2022-12-14 20:33 ` Robin Murphy
2022-12-19 12:16 ` Vladimir Oltean
2023-01-03 18:12 ` Robin Murphy
2023-01-05 12:04 ` Vladimir Oltean [this message]
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